Ballast with starting circuit for high-intensity discharge lamps

Details Ballast with starting circuit for high-intensity discharge lamps Ballast with starting circuit for high-intensity discharge lamps

1998-11-12

2000-08-08

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315224, 315DIG7, G05F 100

Patent

active

061006521

ABSTRACT:
A ballast (10) for powering a discharge lamp (20) comprises an output circuit (300) and a lamp starting circuit (400). The output circuit (300) includes a resonant inductor (310), a resonant capacitor (312), and a direct current (DC) blocking capacitor (314). Lamp starting circuit (400) is magnetically coupled to the resonant inductor (310) and supplies charging current to the DC blocking capacitor (314). The resulting high voltage that is developed across the DC blocking capacitor (314) ignites the lamp (20). In a preferred embodiment, lamp starting circuit (400) includes a starting winding (402), a current-limiting capacitor (406), a first rectifier (410), and a second rectifier (416).

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